Honestly, I really struggled with it. It would have been better if my husband had been around more as well, but during my pregnancy he was commuting to London and was gone 12 - 14 hours a day and worked 7 days a week - so I missed out on a lot of interaction that way. My MiL was wonderful, but even then she could only come around once a week or so. I was very lonely, and very depressed. My mom was able to fly to England the last week of my pregnancy and was here a week before Philip was born and his first week in the world, and that made a HUGE difference. I too have a huge family in the States and my husband's family here is very small.
You will get through it. You will get caught up in your own child, your own belly, and your own new family. It will hurt like hell being away from your family of origin - but you will make it through. There are ways to connect. Web cams are great, we used that a lot. We set up a website and I showed htem my growing bump week by week. I sent TONS of photos over email. I made a lot of phone calls. It is still possible to feel connected, but it does take effort - and it won't ever really replace having them with you.
Keep in mind as well - once you have your baby, you can get involved (through your Health Visitor, they'll sort it out for you) with a group of women who gave birth at the same time, so you'll have an automatic way of making friends and sharing experiences. There are ways to be involved in mother baby groups. Look at your local GP and talk to your midwife, there are pregnancy swimming classes and loads of other things to join - just TELL them you need support and companionship and community because you are far away from your side of the world. THey will help you. And if they don't? MAKE THEM.